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HarmoniCA_psychosis
julia-pfarr/HarmoniCA_psychosis
HarmoniCA_psychosis is a text classification model from julia-pfarr. Use it when you need a label for a piece of text. It is set up for sentence-transformers. The card lists the license as cc-by-4.0.
Part of the HarmoniCA collection for harmonising psychiatric questionnaire items across studies. This model assigns items from psychosis questionnaires to one of two theoretically motivated symptom dimensions.
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Updated Jun 8, 2026
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At a glance
- Task
- Text Classification
- Library
- sentence-transformers
- License
- cc-by-4.0
- Access
- Public
- Created
- Jun 8, 2026
- Updated
- Jun 8, 2026
- SHA
- 3fc5d3b6
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From the Hugging Face model README
HarmoniCA — Psychosis Model
Part of the HarmoniCA collection for harmonising psychiatric questionnaire items across studies. This model assigns items from psychosis questionnaires to one of two theoretically motivated symptom dimensions.
Dimensions
| ID | Label | Description |
|---|---|---|
| 1 | Hallucinations | seeing, hearing, feeling, or smelling things that are not there; perceptual disturbances; illusions |
| 2 | Delusions | false beliefs firmly held despite evidence; paranoid ideation; persecution; grandiosity |
Items rated as not belonging to the psychosis construct are assigned dimension -1 (Does not fit).
Model Architecture
- Type: ContrastiveModel (contrastive fine-tuning of a sentence transformer)
- Base encoder: hkunlp/instructor-large
Training Data
- Training items: 101 expert-labeled questionnaire items (88 original + 11 augmented + 2 expert-reviewed)
- Questionnaires: CAPE-P15, MDS-UPDRS, NMSQuest, NMSS, NPI, PPRS, PQ-B, SAPS-PD, SCL-90, SCOPA-PC, UM-PDHQ, plus data augmentation
- Labels: Expert consensus from two rounds of surveys (psychiatrists/neurologists)
Evaluation
Evaluated on 18 held-out items from unseen questionnaires against expert labels.
| Cohen's κ | Accuracy |
|---|---|
| 0.700 | 83.3% |
Note: The test set is small (n=18), so the confidence interval is wide [0.388, 1.000].
Cross-validation (leave-one-questionnaire-out, 11 folds): mean accuracy 91.4% ± 12.5%.
Limitations
- Trained and validated on Parkinson's disease cohort questionnaires; performance may differ for general-population psychosis scales.
- Dimension structure reflects theoretical consensus among a specific expert panel and may not match all theoretical frameworks.
- Prodromal and subclinical psychosis items are particularly hard to classify; manual review is recommended for low-confidence assignments.
Citation
in preparation
- Task
- Text Classification
- Library
- sentence-transformers
- License
- cc-by-4.0
- Languages
- en
- Created
- Jun 8, 2026
- Updated
- Jun 8, 2026